Custom Shorty GP Exhaust for R3

8182 Views 10 Replies 5 Participants Last post by mobadger72, May 15, 2016

Joseph Infante

Discussion Starter · Dec 22, 2015

Hello everyone. Ive been in and around topics regarding which exhaust to get for my bike while not breaking the bank and I have an interesting mod I'm currently undertaking. I took the original OEM exhaust muffler off to expose the cat and what appears to be a 32MM or 1 1/4 inch OD pipe coming out from the cat. So after doing some research and number crunching I purchased this 32mm elbow to attach to the exhaust opening.

Going to be drilling and tapping it to fit securely to my original exhaust opening and then finding the OD of the elbow to purchase a fitting shorty GP exhaust pipe like below.

https://www.radiantcycles.com/product/style-1/

The reason why I cant just buy the shorty pipe is that the smallest one they make is 38MM or 1.5 inches. Stock OD is 1.25 or 32MM so the elbow will increase it to most likely above 40MM, which is fine because they have everything above 38MM. Anyway I will try and get a video up ASAP but most likely will not have the actual shorty exhaust pipe until next week because I need to measure the elbow adapter piece prior to ordering. This mod does not involve removing the CAT box. Total cost $65 USD

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JiiMc

· #2 · Dec 22, 2015

What about something like this http://japan.webike.net/products/22057751.html ? Might be a little pricey for a piece of metal, but the stock exhaust w/o muffle sounds so good

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Joseph Infante

Discussion Starter · #3 · Dec 22, 2015

JiiMc said:
What about something like this http://japan.webike.net/products/22057751.html ? Might be a little pricey for a piece of metal, but the stock exhaust w/o muffle sounds so good

Honestly that setup is pretty sick, i love how it bolts to the existing holes for the heat shield but this only costed me 60sh bucks and it is roughly the same thing. The only thing i prefer about my setup is that i gain extra foot clearance so the exhaust isnt pumping right at my heel due to the 45 degree adapter and the extra 6 or so inches from the shorty pipe.

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Joseph Infante

Discussion Starter · #4 · Dec 30, 2015

Just posting an update because I had to return some items and rethink the setup due to the original piece being too heavy and not practical. The current setup that I have all planned out is a little different. The parts I have purchased are below

1. 32MM ID Mild Steel Spacer with a 38MM OD
2. 38MM ID Stainless Works 45 Degree exhaust pipe with a 41MM OD
3. Shorty GP Exhaust 41MM ID

I have to drill and tap screws into the steel spacer and 45 degree exhaust pipe as well as the existing exit pipe from the cat box. The shorty GP exhaust has a really nice fit and secure clamp for it so no drilling necessary. I will update later with pictures. So far I only have 2 of the 3 parts delivered.

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Joseph Infante

Discussion Starter · #5 · Dec 31, 2015

Okay here are some updated pictures. The first is the spacer, the 2nd is the 45 degree pipe we shortened and then we just drilled and tapped it to the pipe sticking off the cat box. Sounds more GP like, a little droney but defiantly sounds amazing for only 40sh bucks. Still need the shorty GP exhaust its ordered.

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Joseph Infante

Discussion Starter · #6 · Jan 7, 2016

Update:

Shorty pipe just came in and attached it. I realized the original hole i drilled might be at a slightly off angle but most importantly the stainless steel pipe needs to be shortened alot. This weekend I will be cutting the pipe and adjusting the angle for better aesthetics. But i finally achieved the shorty gp exhaust look. This company is called radiant cycles and the smallest exhaust they have is 38mm which will not work with the oem setup.

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Joseph Infante

Discussion Starter · #7 · Jan 12, 2016

Updated, shorted the pipe finally. Had to wait to get a tool.

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mithryn

· #8 · Apr 28, 2016

I know it's been a while for this thread, but how's the volume on that? Does it make long-ish commutes annoying?

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Joseph Infante

Discussion Starter · #9 · Apr 28, 2016

mithryn said:
I know it's been a while for this thread, but how's the volume on that? Does it make long-ish commutes annoying?

Not at all, I use my bike literally everyday i can/want too and never had a noise problem. The beauty of it is that it still uses the existing stock exhaust/cat box and merely a custom slip on with little to no baffling. Probly have $50 dollars invested. Sounds waaaaaay more aggressive then stock, and most slip ons suck. It is not super loud, but defiantly loud enough to alert people with a quick clutch/throttle. If you want the best sounding exhaust and money is not an issue your go to should be the m4 street slayer and akrapovic full system. The noise also doesnt bother me much since i use a nolan helmet with bluetooth ncom system so i just listen to music anyway. But having the background noise of my exhaust makes the ride/music even better haha. It sounds best in a tunnel. Hope this helps, let me know if you want to know exactly how I did it and ill post a video if you want.